Hi,

I am trying to load HTML content in a Label, for that i am getting data from web service as

I need space between bullet point and List item(

Can anyone tell me how to do this in xamarin forms.

Thanks

Hi guys! Im using Xamarin.Forms 4.7 in my project and have issue with CollectionView.
This bug appears only on iOS and is displayed in approximately one build out of 10. I guess that bottom tabbed page causes this issue. Is there any ways to fix this?

I have a picture file path and I am trying to upload this picture to server. When I upload this picture to server I need it's GetStream() value. I will show a sample code, that I have used in another place:

var content = new MultipartFormDataContent();
content.Add(new StreamContent(_mediaFile.GetStream()), "\"file\"", $"\"{_mediaFile.Path}\"");
var response = await httpClient.PostAsync(new Uri("My REST API"), content);

if (response.IsSuccessStatusCode)
{
   //Success
}

Where _mediaFile is a MediaFile

private MediaFile _mediaFile;

But currently, I have only the picture path. So is there any way to convert the picture path to MediaFile or anyway way to get the GetStream() value of the picture path?

Hi All,

I have a code where I have an image which the user can zoom and move the image when zoomed. I face two difficulties here and I hope someone can help:

• I can move the image in only two directions: left and up. It seems to be fixed to the right and downward somehow.
• I want that the user can only move the image left, right, up and down when zoomed. Moving the image can now already be done without any zooming, which looks a bit strange.

I have a small demo in the attachment (tested on Android).

Hope someone can help!

Regards, Ganesh

I am a newbie in Xamarin.Forms and the architect in our team mentioned, if we wanted a clean architecture, we must avoid using Xamarin.Forms in ViewModel as it references Views directly so it actually doesn't decouple.

But in the most of the tutorials, guides I don't see this being followed.

Can anyone suggest what's the correct guideline, and how does it really support this decoupling? Does everyone follow the same?
Also, when I try to use buttonclick event via a Command class in the ViewModel, I can't use it without using Xamarin.Forms namespace.

How can I achieve pure decoupling without using the Command class?

Hi,

I am trying to load HTML content in a Label. I am getting Data like

I have a div with class name "MobileBody". I want to apply style to it.
I tried the below one but it is working for only IOS, for Android All style tags are displaying ...
if (DeviceInfo.Platform.ToString() == "iOS")
{
ParagraphDesc = ".mobileBody{font-family:Roboto Slab; font-size:14px}" + responseData.BodyContent;
}

Can any one help on this

Hi. I'm trying to pass a List from one view to another, using the MVVM pattern. In my project, I want to store the questions from a List (questions) into another list (errores) and I want to display "errores" in another view. Basically, whenever the wrong True/False button is pressed, I want to store the question into "errores".

Here's what I've tried:

{
    private List<string> errores;

    public RESULTSPAGE2(List<string> errores)
    {
        InitializeComponent();

        MainListView.ItemsSource = errores;


    }


    }
}

//RESULTSPAGE2.xaml
<ContentPage.Content>
        <StackLayout>
            <ListView 
             x:Name="MainListView"   />
        </StackLayout>
    </ContentPage.Content>
</ContentPage>








class QuizPageModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    void OnPropertyChanged([CallerMemberName] string name = "")
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
    }

    public List<Question> questions;

    List<string> errores = new List<string>();



    private string _textopregunta;

    public string TextoPregunta
    {
        get
        {
            return _textopregunta;
        }

        set
        {
            _textopregunta = value;
            OnPropertyChanged();
        }
    }

    //Add Color
    /* private Color _BackgroundFalseButton;

     public Color BackgroundFalseButton
     {
         get
         {
             return _BackgroundFalseButton;
         }
         set
         {
             _BackgroundFalseButton = value; //You must implement INotifyChanged
             OnPropertyChanged(nameof(BackgroundFalseButton));
         }

     }*/



    private bool _wrongAnswer;
    public bool WrongAnswer
    {
        get
        {
            return _wrongAnswer;
        }

        set
        {
            _wrongAnswer = value;
            OnPropertyChanged();
        }
    }


    private bool _currentAnswerValue;
    public bool CurrentAnswerValue
    {
        get
        {
            return _currentAnswerValue;
        }

        set
        {
            _currentAnswerValue = value;
            OnPropertyChanged();
        }
    }

    private int _totalQuestions;
    public int TotalQuestions
    {
        get
        {
            return _totalQuestions;
        }

        set
        {
            _totalQuestions = value;
            OnPropertyChanged();
            OnPropertyChanged(nameof(TitleText));
        }
    }

    private int _currentQuestionNumber;
    public int CurrentQuestionNumber
    {
        get
        {
            return _currentQuestionNumber;
        }

        set
        {
            _currentQuestionNumber = value;
            OnPropertyChanged();
            OnPropertyChanged(nameof(TitleText));
        }
    }

    public string TitleText
    {
        get { return $"Question {_currentQuestionNumber} of {_totalQuestions}"; }
    }

    private int score;

    private Random random;

    public Command AnsweredTrue { get; }
    public Command AnsweredFalse { get; }
    public string QuestionText { get; }



    public QuizPageModel()
    {
        // initialise RNG
       random = new Random();

        // populate question list - replace with external data source in production
        questions = new List<Question>()
        {
            new Question() { QuestionText="1=2", Answer=false } ,
            new Question() { QuestionText="2+2=3", Answer=false },
            ..........
        };



            // initialise quiz values
            TotalQuestions = questions.Count;
        CurrentQuestionNumber = 1;
        score = 0;

        // load first question
        LoadQuestion();



        //True/False

        AnsweredTrue = new Command<Question>(async (question) =>
        {
            Debug.WriteLine("True button pressed");


            /* AnsweredTrue = new Command(async () =>
             {
             Debug.WriteLine("True button pressed");*/

            // check if answer is correct
            if (_currentAnswerValue == true)

                score++;



            else
            {

                errores.Add(QuestionText);


            }


        // load next question or results page
        if (CurrentQuestionNumber < TotalQuestions)
        {
            // increase question counter
            CurrentQuestionNumber++;
            LoadQuestion();
        }
        else
        {
            Debug.WriteLine("End of Quiz");
            await ShowResults().ConfigureAwait(false);
        }
    });



        AnsweredFalse = new Command(async () =>
        {
            Debug.WriteLine("False button pressed");



            // check if answer is correct
            if (_currentAnswerValue == false)
                score++;

            else
            {
                errores.Add(QuestionText);
                //_wrongAnswer = true;

            }


        /*    if (_wrongAnswer == true)
            {
                errores.Add(QuestionText);

            }

            */

        // load next question or results page
        if (CurrentQuestionNumber < TotalQuestions)
        {
            // increase question counter
            CurrentQuestionNumber++;
            LoadQuestion();
        }
        else
        {
            Debug.WriteLine("End of Quiz");
            await ShowResults().ConfigureAwait(false);
        }
    });
    }


    private void LoadQuestion()
    {
        var index = random.Next(questions.Count);
        TextoPregunta = questions[index].QuestionText;
        CurrentAnswerValue = questions[index].Answer;
        questions.RemoveAt(index);
    }

    // private async Task ShowResults() => await Application.Current.MainPage.Navigation.PushAsync(new LVTest(score, _totalQuestions, errores)).ConfigureAwait(false);
    private async Task ShowResults() => await Application.Current.MainPage.Navigation.PushAsync(new RESULTSPAGE2(errores));

}

}

I'm using a TabbedPage with Xamarin.Forms, and when a user is already on Tab 2, and clicks on Tab 2, I'd either like that tab to reload, or i'd like to run my own custom code to refresh the page.

I have been trying to find any sort of event I could hook into, or a way to do this with custom renderers but have been unable to find anything. What's the simplest way to do this?

Thanks!

Hi All,
As I wrote in the title, it's possible to add Tap gesture to the Entry?
This code works for Label but doesn't work for Entry:

var tapEntryRecognizer = new TapGestureRecognizer(); tapFocusEntryRecognizer.Tapped += async (s, e) => { Console.WriteLine("tapped"); }; tapEntry.GestureRecognizers.Add(tapFocusEntryRecognizer);

I worked with VS 2017 until recently, and changed to VS 2019.
I also updated Xamarin.Forms

I try a simple app with a service, which works fine on the emulator.
When I try to run it on a real device, I get the next deployment error:

ADB0010: Deployment failedMono.AndroidTools.InstallFailedException: Unexpected install output: pkg: /data/local/tmp/com.companyname.tryservice_proj-Signed.apkFailure [INSTALL_PARSE_FAILED_MANIFEST_MALFORMED] at Mono.AndroidTools.Internal.AdbOutputParsing.CheckInstallSuccess(String output, String packageName) in E:\A_work\963\s\External\androidtools\Mono.AndroidTools\Internal\AdbOutputParsing.cs:line 348

In my searching I've seen that possible reason can be that the name of the package begins with a Capital letter.
I've checked in AndroidManifest.xml and it begin with a small letter as it should

Any suggestion will be appreciated.

Good evening, I'm trying to create a listview with mvvm model with inside it a "Polygon" element in the item-template.
I have a button inside that allows you to hide / show elements and the RefreshListViewItem method is called from code at the click of the button .
On refreshing it would appear that the "Polygon" loses the data binding of the model.
Is anyone else having this problem?
Thank you!

Question 1. - Is there a way to get the Frames to be flexible ? I mean to get the frames in the bottom line to be closer to the upper line to close the gap.

Question 2. - Is there a way to get the collectionview items to separate frames or to get them a border like the frames has ?

<CollectionView IsGrouped="True" ItemsSource="{Binding DLHY_VYPIS}">
            <CollectionView.ItemsLayout>
                <GridItemsLayout Orientation="Vertical" Span="4" />
            </CollectionView.ItemsLayout>
            <CollectionView.GroupHeaderTemplate>
                <DataTemplate>
                    <Label x:Name="vyslednasuma" FontAttributes="Bold" Text="{Binding VyslednaSuma}" TextColor="{DynamicResource PrimaryTextColor}">
                        <Label.Triggers>
                            <DataTrigger TargetType="Label" Binding="{Binding Bool_farba_textu}" Value="True">
                                <Setter Property="TextColor" Value="{DynamicResource RedText}"/>
                            </DataTrigger>
                        </Label.Triggers>
                    </Label>
                </DataTemplate>
            </CollectionView.GroupHeaderTemplate>
            <CollectionView.ItemTemplate>
                <DataTemplate>
                    <StackLayout VerticalOptions="FillAndExpand">
                    <Frame CornerRadius="10" OutlineColor="{DynamicResource PrimaryTextColor}" Padding="5" Margin="5">
                        <StackLayout BackgroundColor="{DynamicResource PageBackgroundColor}" Padding="5">
                            <Label Text="{Binding Popis}" Margin="0" TextColor="{DynamicResource PrimaryTextColor}" BackgroundColor="{DynamicResource PageBackgroundColor}"/>
                            <Label Text="{Binding KEDY}" Margin="0" TextColor="{DynamicResource PrimaryTextColor}" BackgroundColor="{DynamicResource PageBackgroundColor}"/>
                            <Label Text="{Binding KOĽKO,StringFormat='{0:N}€'}" Margin="0" TextColor="{DynamicResource PrimaryTextColor}" BackgroundColor="{DynamicResource PageBackgroundColor}"/>
                            <!--<Button Text="DELETE" Command="{Binding Source={x:Reference DLHY_USER_}, Path=BindingContext.TEST}" CommandParameter="{Binding ID}"/>-->
                            <Image Source="delete_bin_icon" WidthRequest="15" HeightRequest="15" HorizontalOptions="End">
                                <Image.GestureRecognizers>
                                    <TapGestureRecognizer  Command="{Binding Source={x:Reference DLHY_USER_}, Path=BindingContext.TEST}" CommandParameter="{Binding ID}"/>
                                </Image.GestureRecognizers>
                            </Image>
                        </StackLayout>
                    </Frame>
                    </StackLayout>
                </DataTemplate>
            </CollectionView.ItemTemplate>
        </CollectionView>

Hello Devs! I was using FreshMVVM in my Xamarin Forms Project, I implemented Button Command Parameter in my LoginPage but it seems the Button doesn't have connect with the LoginPageModel, I use XF Material Library.

Here is the Register Button in LoginPage.Xaml:

<material:MaterialButton
 CornerRadius="5" Margin="0, 0, 0, 30"
Text="Register Here" BackgroundColor="#FFFFFF"
TextColor="#275685" ButtonType="Text"
PressedBackgroundColor="Transparent"
x:Name="BtnRegister" VerticalOptions="End"
Command="{Binding RegisterCommand}" />

and this is the LoginPageModel.cs:

using FreshMvvm;
using PropertyChanged;
using System.Threading.Tasks;
using System.Windows.Input;
using Xamarin.Forms;
namespace buziTrade.PageModels
{
[AddINotifyPropertyChangedInterface]
public class LoginPageModel : FreshBasePageModel
{
public ICommand RegisterCommand => new Command(async () => await RegisterPage());
public LoginPageModel()
{
}
public override void Init(object initData)
{
base.Init(initData);
}
private async Task RegisterPage()
{
await CoreMethods.PushPageModel<RegisterPageModel>();
}
}
}

@MichaelRidland @Martijn00

Hi all,

I use PDFSharp.Xamarin.Forms in my app (Android and iOS). I initiated the package in MainActiviy.cs:

This works in general, but sometimes I get a strange error which causes my app to crash:

System.InvalidOperationException: PdfSharp.Xamarin.Forms already initialized before

Where does this error come from and how to solve this?

Does anyone know the most up-to-date way to use AdMob for android please? Since the breaking changes in version 17.0.0 of the SDK you can no longer use the same method James Montemagno uses, and his way is pretty much what is all over the internet.
By that I mean, he initialises ads using the app id in MainActivity.cs , now it is required to be in the AndroidManifest.xaml in a <metadata/> tag.

Also, if anyone knows how to make Native ads and consume them with forms I would love to have a resource or guide I can follow for this. Thanks in advance.

Dear All,

I am working on xamarin mobile MVVM application. I have a drop down list and based on selection i want to generate no of checkbox. If any body has done then please help me.

Regards,
Hiren Patel

Hi Xamarin dev's

My IOS version app works successfully on Simulator but it is crash and doesn't lunch on physical device without errors.
This is the application output

dyld: Library not loaded: @rpath/GoogleToolboxForMac.framework/GoogleToolboxForMac
Referenced from: /private/var/containers/Bundle/Application/0C69CF2C-BD07-4F3B-A78D-89DFD2D88D4D/Shaabiat.iOS.app/Shaabiat.iOS
Reason: no suitable image found. Did find:
/private/var/containers/Bundle/Application/0C69CF2C-BD07-4F3B-A78D-89DFD2D88D4D/Shaabiat.iOS.app/Frameworks/GoogleToolboxForMac.framework/GoogleToolboxForMac: code signature invalid for '/private/var/containers/Bundle/Application/0C69CF2C-BD07-4F3B-A78D-89DFD2D88D4D/Shaabiat.iOS.app/Frameworks/GoogleToolboxForMac.framework/GoogleToolboxForMac'

/private/var/containers/Bundle/Application/0C69CF2C-BD07-4F3B-A78D-89DFD2D88D4D/Shaabiat.iOS.app/Frameworks/GoogleToolboxForMac.framework/GoogleToolboxForMac: stat() failed with errno=1

and the packages

Please need your help

Hello,
I am creating an app for ios and android with help of xamarin.forms. When I am connecting my iphone device with my mac system for debugging the code it is not showing in the debug list. There is still showing Ios device. But if I open any other project of xamarin.forms Iphone option is showing in the debug list. I don't know why it is not showing only in one project. Is there any setting to enable the iphone device for project? Or any other way to manage iphone device with project?

I am trying to access Google Drive from an XF.UWP app. The Client ID for UWP form on Google API Console is asking to fill in the 'last part of your app's Microsoft Store URL'. What to fill in here, any idea?

I have filled 'com.mycompany.myappname' here and Protocol URL in Package.appxmanifest file. I am setting redirect_uri also to the same thing with a suffix of ':/oauth2redirect'.

In the declaration of Protocol URL, I am setting the StartPage to MainPage.xaml after checking the ExecutableOrStartPageIsRequired box.

My app crashes after 'Allow' is pressed while authenticating.

Any clue what to do?